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Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Inventory Net [Abstract] |  |
Raw materials | $ 16,561 | $ 18,444
Work in process | 6,633 | 3,182
Finished goods | 773 | 940
Obsolescence allowance | (1,517) | (1,597)
Total inventories | $ 22,450 | $ 20,969

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